You will be given a definition of a task first, then some input of the task.
In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D". 

[header] How to hold a door open with a coin [title] Grab a coin. [step] Canadian/us quarter or 20/50 euro cents work well. Avoid using small coins like pennies or dimes as they do not have enough surface area to hold the door open. <sep> (A) Euro coins help with coin lock as well. [title] Fold your hand under and to the right. (B) [title] Pull up and shove the coin in. [step] Your hand should go so that its ring with the shape of a dollar on it faces front. (C) [title] Open the door just wide enough to access the coin you are holding. [step] This way the coin will be able to hang on to the door by itself. (D) You may need more than one coin if you're unable to jam the door open with a single coin. [substeps] If you're in another country like australia or south korea, use the largest and thickest coin possible.
Output:
D